Chindaprasirt Prinya, Jaturapitakkul Chai, Chalee Wichian, Rattanasak Ubolluk
Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand.
Waste Manag. 2009 Feb;29(2):539-43. doi: 10.1016/j.wasman.2008.06.023. Epub 2008 Aug 19.
This research was conducted to compare geopolymers made from fly ash and ground bottom ash. Sodium hydroxide (NaOH) and sodium silicate (Na(2)SiO(3)) solutions were used as activators. A mass ratio of 1.5 Na(2)SiO(3)/NaOH and three concentrations of NaOH (5, 10, and 15M) were used; the geopolymers were cured at 65 degrees C for 48 h. A Fourier transform infrared spectrometer (FT-IR), differential scanning calorimeter (DSC), and scanning electron microscope (SEM) were used on the geopolymer pastes. Geopolymer mortars were also prepared in order to investigate compressive strength. The results show that both fly ash and bottom ash can be utilized as source materials for the production of geopolymers. The properties of the geopolymers are dependent on source materials and the NaOH concentration. Fly ash is more reactive and produces a higher degree of geopolymerization in comparison with bottom ash. The moderate NaOH concentration of 10 M is found to be suitable and gives fly ash and bottom ash geopolymer mortars with compressive strengths of 35 and 18 MPa.
本研究旨在比较由粉煤灰和磨细底灰制成的地质聚合物。使用氢氧化钠（NaOH）和硅酸钠（Na₂SiO₃）溶液作为活化剂。采用1.5的Na₂SiO₃/NaOH质量比和三种NaOH浓度（5M、10M和15M）；地质聚合物在65℃下养护48小时。对地质聚合物浆料使用傅里叶变换红外光谱仪（FT-IR）、差示扫描量热仪（DSC）和扫描电子显微镜（SEM）。还制备了地质聚合物砂浆以研究抗压强度。结果表明，粉煤灰和底灰均可作为生产地质聚合物的原料。地质聚合物的性能取决于原料和NaOH浓度。与底灰相比，粉煤灰反应性更强，产生的地质聚合程度更高。发现10M的适度NaOH浓度是合适的，可使粉煤灰和底灰地质聚合物砂浆的抗压强度分别达到35MPa和18MPa。
